The third purchaser or possessor of the real estate subject to collation may avoid the effect of the action of revendication, by paying to the coheirs of the donee, to whom the collation is due, to wit: the excess of the value of the property above the disposable portion, if the donation has been made as an advantage or extra portion, or the whole of the value thereof, if the donation has been made without this provision, by fulfilling in this respect all the obligations by which the donee himself was bound towards the coheirs.